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#M3u file to mp3 generator
So that means you can't change one bit of the key and get the same Guid (or by random chance another valid Guid)īELOW IS THE CODE FOR MY PRODUCT KEY GENERATOR using System NOTE: The product keys is a direct (one for one) representation of the Guid it was generated from.
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A Guid is a 16 byte value and running it through a good Base36 encoder which using the following key will give you the same Microsoft style product keys:īase36 Encoding Digits: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ (36 characters in all) This method has some draw backs:Ī) The key you give the customer will be rather largerī) You can hash the key like some folks in this thread suggested, but any hash other than MD5 would again be larger then the typical 25 character product keys you see with Microsoft.Īgain, this is not an exhaustive listing of all the various ways of implementing product keys, but hopefully these trivial methods help raise everyone's understanding of how the big companies do it. The customer would be given a much larger key that typically would be 256 bytes long (considering you use a RSA 2028 key vs 1024). This way the customer won't have aĢ) If you want you code to validate it offline (meaning the installer does not contact the Mother Ship to verify), you can take your same Guid, Hash and sign it with a RSA key from "The Mother Ship". The best way to do this is to take a Guid and Base36 encode it so the 32 character Guid becomes 25 characters. Valid (just in case you decided to deny the key for some reason like finding it on the internet). So your code should take their input (do a simple validation or two), and send it back to a SOAP or WCF endpoint to confirm that the key is good and still 1) If your like me, you want the key you give your customers to be verified before installation.